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ZnS nanorods and Cr2O3 nanoparticle decorated ZnS nanorods were synthesizedusing facile hydrothermal techniques and their ethanol sensing properties wereexamined. X-ray diffraction and scanning electron microscopy revealed the goodcrystallinity and size uniformity of the ZnS nanorods. The Cr2O3 nanoparticledecorated ZnS nanorod sensor showed stronger response to ethanol than thepristine ZnS nanorod sensor. The responses of the pristine and decoratednanorod sensors to 200 ppm of ethanol at 300oC were 2.9 and 13.8, respectively.Furthermore, under these conditions, the decorated nanorod sensor showed longerresponse time (23 s) and shorter recovery time (20 s) than those of thepristine one (19 and 35 s, respectively). Consequently, the total sensing timeof the decorated nanorod sensor (42 s) was shorter than that of the pristineone (55 s). The decorated nanorod sensor showed excellent selectivity toethanol over other volatile organic compound gases including acetone, methanol,benzene, toluene, whereas the pristine one failed to show selectivity toethanol over acetone. The improved sensing performance of the decorated nanorodsensor is attributed to the modulation of the conduction channel width and thepotential barrier height at the ZnS Cr2O3 interface accompanying the adsorptionand desorption of ethanol gas as well as the greater surface to volume ratio ofthe decorated nanorods than the pristine one due to the existence of the ZnSCr2O3 interface.

Prominent ethanol sensing with Cr2O3 nanoparticle-decorated ZnS nanorods sensors